I could tell you where I got one but I don't think that's the issue. Size, price, materials of construction, fittings, how soon you need it,... I think those are your considerations.
Is the shipping low enough that you should buy it mail order instead of your LHB?
In my state, the taxes are high enough, that I can buy from out of state & save money. So I buy equipment out of state and food from my LHBS.